/Engine/Source/Runtime/Engine/Classes/Engine/Engine.h
Allows external systems to add a new simple engine stat function.
void AddEngineStat ( const [FName](API\Runtime\Core\UObject\FName) & InCommandName, const [FName](API\Runtime\Core\UObject\FName) & InCategoryName, const [FText](API\Runtime\Core\Internationalization\FText) & InDescriptionString, [FEngineStatRender](API\Runtime\Engine\Engine\UEngine\FEngineStatRender) InRenderFunc, [FEngineStatToggle](API\Runtime\Engine\Engine\UEngine\FEngineStatToggle) InToggleFunc, const bool bInIsRHS )